M\NN DIATOMS OF THE ILBATROSS VOYAGES. '_ \. > , 



pi. 164./. f- O'Meara, Proc. Roy. [riflh Acad. II. 2: 261. L875. flat! I' 

 Elo; linb. 16: lit::. L889. (.run. Denkschr. Akad. Wien 48': 82. 



DeToni, Syll. Alg. 2: L231. L894. 



Coscinodiscus symbolophorus Grun. Denkschr. Akad. Wien 48': s l'. pi. 

 L884. Ratt. Proc. Roy. Soc. Edinb. 16: 192. L889. Schmidt, Atlas pi. i 

 i 5. De Toni, Syll. Ug. 2: L230. 1894. 



I include in this species a large dumber of varieties found in tin- various dredgings 

 and soundings named. I am convinced thai there is no reasonable ground f< 

 now's C. symbolophorus as distinguished from Roper's older name C.stellaris. Grunow 

 admits ilia t the difference is one of relative fineness oi marking too slight ;i character 

 for creating a new species, especially when this difference is by no means striking 

 and many intermediate forms are obtainable. Both have the same relative convex- 

 ity of valve; the same striking stellate cluster at the center; the same arrangemenl of 

 fine beading, namely, in fascicles whose componenl rows are parallel to the 1 

 radial middle row. By thus abandoning the untenable distinction s< parating these 

 two we nave a Bharply defined Bpecies, its nearesl relative I >• ■ i r i lt C. subtilis Ehrenb., 

 from which ii is distinguished by the stellate marking of the center and the absenc 

 of minute process* s next the border. The older specific names of Ehrenberg given 

 above under the now-abandoned genus Symbolophora take precedence over th 

 Grunow and Hope)-. I have selected S. pentas, published simultaneously with S. 

 microtrias and S. tetras, because I have found the five-parted star al the center to be 

 more common than the resl and because Ehrenberg's illustration cited above is quite 

 satisfactory. 



Found ai stations 2807, 2848, 2859, 2860, 2919, 3346, 3361H, 3603, 3604 3604H, 

 3671, 4029H, Galapagos Islands, off Alaska peninsula, off British Columbia to south- 

 ern California and Bering Sea. 

 Coscinodiscus pustulatus Mann. sp. nov. Plate XLVIII, figi re 3. 



Valve strongly and evenly convex, covered with large conical (not hemispherical 

 beads, symmetrically arranged in decussating rows, as in C. symrnetricus Grev., the 

 largesi at the center and regularly decreasing to the border, bul terminating just 

 within the border in asinglerowof increased Bize; border broad, stout, and hyaline. 

 The heavy cone-shaped beads give a remarkable brilliancy to the diatom. 



Diameter of valve, 0.1 mm. 



Type in the I'. S. National Museum, No. 590156, from Btation 3565H, Bering - 

 July 6, L895; L,866 fath s, bottom of blue mud ooze. 



Ii should be here noted thai whal resembles a pseudonodule near the border in the 

 photograph herewith reproduced is, together with three flecks near <li<- center, due 

 to defects in i he negal ive. 



Coscinodiscus radiatus Ehrenb. Phys. AM). Akad. Wiss. Berl. 1839: I 18. pi. 8. f. 



la-c nol d. . IMI: Mikrog. pi. 19. f. i. pi. :.'./. ■ ;. pi. ■•■. XIII. f. : (nol 



pi..,.,. A" 17. ; 6, pl.S5A. XVII. f. 6 doubtful pi. W. /./. .:. pi L854. 



Pritch. Bist. Enfus. ed. I. 830. pi. //./'. 89, 40. 1861; Schmidt, Atlas pi. 60. f. 

 io. pi. 61. f. IS (undetermined . L878; pi. no name . 1881; } >I. 



11.;. j. s. 15 no name). 21. 1888. Schmidt, Jahresb. Komm. Deut. Meere 2: 94. 



pi. ■;. ./'. 84. 1874. Grun. Denkschr. Akad. Wien 48 J : 71. pi S.J 1884. 



Cleve & Moll, types no. 57, III. 155, 164, 207, i'ILlM:.. 257. Van Beur. Synop. 



1>1. 129. f. I. L881. Castr. Rep. Voy. Chall. Bot. 2: L65. pi. 19. f. .'. 11, ir,. ' \^\ 



Ran. Proc. Eloy. Soc. Edinb. 16: -MI. L889. DeToni, Syll. Alg. 2: li'li. L894. 

 exclude here C. radiatus Bail. Am. Journ. Sci. 42: 95. pi :./. /.. 1842; als 



radiatus Weisse, Bull. Acad. St. Petersb. 12: li'i'. /-/. /. /'. ?5. L8 

 Coscinodiscus caspius Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1872:394. pi l . I 



/.;. L873. 

 Coscinodiscus borealis Ehrenb. Monatsber. Akad. Wiss. Berl. 1861: 294. 1862, nol 



C. borealis Bail. Am. Journ. Sci. 22: .". 



